Table 1 Source populations and admixture date estimates for each hybrid sample

Target	Source1	Source2	f3-statistics			MixMapper date estimates
			f3	Err	Z	α	Mixed drift	Years (N_e = 375k)
NPC	East	Beringian	−0.05	0.009	−5.28	0.48–0.59	0.00–0.00	0
SYT	East	Beringian	−0.17	0.003	−48.66	0.52–0.78	0.00–0.00	0
YTAK	East	Beringian	−0.15	0.003	−47.41	0.48-0.73	0.00–0.23	0–393,996.5

Admixture date estimates in years based on an effective population size (N_e) of 375k (ref. ¹²) for the North Pacific Coast island (NPC) and the two Alaska-Yukon hybrids (SYT from Southern Yukon and YTAK from the northern Alaska-Yukon border). Err indicates the standard error and Z indicates the Z-score

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